Moon's ruling Democratic Party kept its top post with 52.9 percent in support scores this week, up 0.6 percentage points from a week earlier.

The main opposition Liberty Korea Party came next with 14.8 percent of support, down 2.1 percentage points from the previous week.

It was followed by the minor conservative Righteous Party and the centrist People's Party with 6.8 percent and 6.3 percent each this week. The minor progressive Justice Party won 5.5 percent of support.